Breous E, Somanathan S, Bell P, Wilson JM. Inflammation promotes the loss of adeno-associated virus-mediated transgene expression in mouse liver.
Gastroenterology 2011;
141:348-57, 357.e1-3. [PMID:
21640112 PMCID:
PMC3269906 DOI:
10.1053/j.gastro.2011.04.002]
[Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2011] [Revised: 03/07/2011] [Accepted: 04/01/2011] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS
Non-self transgenes delivered to mouse liver via adeno-associated virus (AAV) are expressed stably due to the induction of immune tolerance. However, such transgene expression has been reported to be lost in higher-order primates. We investigated whether inflammatory processes, which likely differ between species, impact the stability of transgene expression.
METHODS
We developed a mouse model that mimics a scenario in which a subject that has received hepatic AAV-mediated gene transfer develops subsequent, vector-unrelated, systemic inflammation.
RESULTS
Inflammation eliminated previously stable expression of transgenes delivered by AAV; the limited tissue destruction and persistence of AAV genomes implicated pathways besides the cytotoxic T-cell response. Tumor necrosis factor-a down-regulated expression of the transgene from the AAV, indicating a role for similar inflammatory cytokines in such loss of transgene expression.
CONCLUSIONS
Inflammation can block AAV-mediated expression of transgenes in mouse liver. The presence of inflammation might therefore affect hepatic expression of transgenes from viral vectors in humans.
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